Molecular Markers for MRCV Resistance in Maize Breeding
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Solution Overview
Problem
Current methods for controlling Mal de Rio Cuarto Virus (MRCV) in maize crops are ineffective, with limited commercially available hybrids showing strong resistance, and existing breeding techniques are slow and inaccurate in introducing MRCV resistance into elite corn germplasm.
Innovation Solution
A method using marker-assisted breeding to select maize plants with increased MRCV resistance by detecting specific marker nucleic acids such as PZA02272-3, DAS-PZ-11980, and others, allowing for the introgression of resistance traits into new plants through traditional breeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional selective breeding is used to develop MRCV resistant maize lines, then resistance can be introduced into corn germplasm, but the process is slow and inaccurate with limited commercial hybrids showing strong resistance
Solution Approach 1:
The patent performs preliminary identification and characterization of QTL regions associated with MRCV resistance before breeding operations. By pre-mapping resistance loci on chromosomes 1, 2, 4, and 10 and developing associated molecular markers, the invention enables breeders to select resistant plants based on genetic markers rather than waiting for phenotypic expression, dramatically accelerating the breeding process while improving reliability of resistance introduction
Solution Approach 2:
The patent replaces traditional mechanical/phenotypic selection methods with molecular marker-based selection. Instead of relying on visual phenotypic assessment of resistance traits, the invention uses DNA markers linked to resistance QTL to identify and select resistant plants at the molecular level, providing more accurate and faster selection with greater reliability
2Object-generated harmful factors
If Bt technology is widely adopted to control insects, then insecticide use decreases, but leaf hopper populations increase leading to amplified MRCV disease pressure
Solution Approach 1:
The patent introduces molecular markers as an intermediary tool that bridges the gap between insect control strategies and viral disease management. By using markers linked to resistance QTL, the invention enables direct selection of plants with genetic resistance to MRCV, providing a mechanism to counteract increased disease pressure resulting from reduced insecticide use in Bt crops
Solution Approach 2:
The patent changes the parameter of disease resistance from being environmentally dependent (phenotypic selection) to being genetically determined (molecular marker selection). By identifying and selecting plants with specific marker alleles associated with resistance QTL, the invention creates a more stable and predictable resistance parameter that can withstand increased viral disease pressure
3Productivity
If molecular markers are used to map and select MRCV resistance QTL, then the speed and accuracy of moving resistance into elite hybrids increases, but the complexity of breeding procedures increases
Solution Approach 1:
The patent segments the complex resistance trait into discrete molecular markers associated with specific QTL regions on chromosomes 1, 2, 4, and 10. By dividing the resistance characteristic into identifiable marker loci, the invention simplifies the selection process despite the underlying genetic complexity, allowing breeders to target specific resistance regions independently
Solution Approach 2:
The patent creates molecular copies (markers) of the resistance information that can be detected and selected without requiring the full complexity of the resistance phenotype. These marker copies serve as proxies for the actual resistance genes, enabling selection based on simplified molecular signals rather than complex phenotypic evaluation
Data Source
AI summary
This invention relates to methods for identifying maize plants that having increased MRCV resistance. The methods use molecular markers to identify and to select plants with increased MRCV resistance. Maize plants generated by the methods of the invention are also a feature of the invention.